G - Physics – 09 – G
Patent
G - Physics
09
G
375/34
G09G 3/00 (2006.01) G01R 13/40 (2006.01)
Patent
CA 1138136
ABSTRACT Two waveform traces to be simultaneously displayed are sampled and converted to a series of digital sample values. An electro-optic display, e.g. a liquid crystal or electroluminescent display has a first m set and a second n set of electrodes arranged in a matrix having m x n display elements. The matrix may be in cartesian XY or r .THETA. polar co-ordinate format. In one form the m set of electrodes are arranged in two subsets alternating with one another forming a subset mo of odd rows and a subset me of even rows. Coded waveforms Vi, each having a different shape over a period T are applied to one subset mo of the m electrodes whilst another voltage is applied to the other subset me of m electrodes followed by application of Vi to the subset me and the other vol- tage to subset mo. Selected ones of the coded waveform Vi are generated and applied to the n electrodes, the choice of such selectively produced waveforms being related for each successive n electrode to successive samples values of the two traces and the order of coded waveforms on the m set of electrodes. As a result traces are displayed at intersections where the same waveform occurs periodically and simultaneously. The coded waveforms Vi applied to the m electrodes may be produced by a pseudo random generator. The selected ones of the coded waveforms Vi applied to the n electrodes may be produced by a read only memory supplied with trace sample values stored in a random access memory. A priority encoder modifies each sample value of the traces as necessary to ensure that two values for any given n electrode do not appear on the same sub- set of m electrodes.
351208
Fetherstonhaugh & Co.
National Research Development Corporation
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